Electric rotating machine

ABSTRACT

In an electric rotating machine which can improve rotating machine efficiency by suppressing a harmonic component of rotor magnetomotive force and reducing harmonic core loss, a permanent magnet is furnished in some of inter-magnetic pole portions, the inter-magnetic pole portion being formed between a first claw-shaped magnetic pole portion and a second such pole portion; the shapes of first and second chamfered portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second chamfered portions provided in an inter-magnetic pole portion having no permanent magnet inserted; or the shapes of a first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where no permanent magnet is inserted.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.17/087,998 filed Nov. 3, 2020, in the U.S. Patent and Trademark Office,which application claims priority from Japanese Patent Application No.2019-225040, filed Dec. 13, 2019, in the Japanese Patent Office, whichapplications are incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present application relates to an electric rotating machine having arotor constituted by claw-shaped magnetic pole portions.

2. Description of the Related Art

In an electric rotating machine, a rotor arranged with a constant gap onthe inner circumferential side of a stator magnetic pole includes: aplurality of pairs of claw-type magnetic poles arranged in face-to-facerelation, the claw-type magnetic poles being integrally mounted on ashaft and each pair of the claw-type magnetic poles being formed with aclaw portion having an N pole and a claw portion having an S pole ateach top portion; a field winding (rotor winding) that generatesmagnetization force in the claw-type magnetic poles; and a permanentmagnet alternately arranged between the claw portions of the claw-typemagnetic poles arranged in face-to-face relation. A distance L1 betweenthe claw portions of the claw-type magnetic poles arranged face-to-facerelation where the permanent magnet is arranged is made narrower than adistance L2 between the claw portions of the claw-type magnetic polesarranged in face-to-face relation where the permanent magnet is notarranged (for example, see Patent Document 1).

-   Patent Document 1: JP-A-H11(1999)-98787

In the prior art described in Patent Document 1, the amount of rotormagnetomotive force is different between an inter-magnetic pole portionwhere the permanent magnet is inserted and an inter-magnetic poleportion where the permanent magnet is not inserted and accordingly aharmonic component of the rotor magnetomotive force is increased androtating machine efficiency is reduced due to an increase in harmoniccore loss.

BRIEF SUMMARY OF THE INVENTION

The present application is implemented to solve the foregoing problem,and an object of the present application is to provide an electricrotating machine which can improve rotating machine efficiency bysuppressing a harmonic component of rotor magnetomotive force andreducing harmonic core loss.

The electric rotating machine disclosed in the present application is anelectric rotating machine which includes: a rotor; and a statorconfigured to be arranged via an air gap with respect to the outercircumference of the rotor; the rotor being configured to have a rotorwinding, and a pole core body which is constituted by combining a firstpole with a second pole and in which the rotor winding is arranged in aninternal space formed by the first pole and the second pole; the firstpole being configured to have a plurality of first claw-shaped magneticpole portions arranged with a space in the rotation direction of therotor; the second pole being configured to have a plurality of secondclaw-shaped magnetic pole portions arranged with a space in the rotationdirection of the rotor; the first claw-shaped magnetic pole portion andthe second claw-shaped magnetic pole portion being configured to befurnished with a permanent magnet in some of inter-magnetic poleportions, the inter-magnetic pole portion being formed between the firstand second claw-shaped magnetic pole portions; and the first pole andthe second pole being configured to be combined so that the firstclaw-shaped magnetic pole portion and the second claw-shaped magneticpole portion are alternately engaged; the electric rotating machineincluding: first magnetic flux adjusting portions configured to beprovided on both side surfaces in the rotation direction of the firstclaw-shaped magnetic pole portion to reduce the distance between thefirst claw-shaped magnetic pole portion and the second claw-shapedmagnetic pole portion; second magnetic flux adjusting portionsconfigured to be provided on both side surfaces in the rotationdirection of the second claw-shaped magnetic pole portion to reduce thedistance between the claw-shaped magnetic pole portion and the secondclaw-shaped magnetic pole portion; a pair of first chamfered portionsconfigured to be provided on both end sides in the rotation direction onthe stator side surface of the first claw-shaped magnetic pole portion;and a pair of second chamfered portions configured to be provided onboth end sides in the rotation direction on the stator side surface ofthe second claw-shaped magnetic pole portion. In the electric rotatingmachine, the shapes of the first chamfered portion and the secondchamfered portion, which are adjacent to the inter-magnetic pole portionwhere the permanent magnet is inserted, are configured to be differentfrom those of the first chamfered portion and the second chamferedportion, which are adjacent to an inter-magnetic pole portion (22 b)where the permanent magnet (23) is not inserted; and/or the shapes ofthe first magnetic flux adjusting portion and the second magnetic fluxadjusting portion, which are adjacent to the inter-magnetic pole portionwhere the permanent magnet is inserted, are configured to be differentfrom those of the first magnetic flux adjusting portion and the secondmagnetic flux adjusting portion, which are adjacent to theinter-magnetic pole portion where the permanent magnet is not inserted.

According to the rotor of the electric rotating machine disclosed in thepresent application, the structure of the chamfered portion and/or themagnetic flux adjusting portion between the inter-magnetic pole portionwhere the permanent magnet is inserted and the inter-magnetic poleportion where the permanent magnet is not inserted, is different,whereby a rotor magnetomotive force waveform can be made a symmetricwaveform, a harmonic component of the rotor magnetomotive force issuppressed, and harmonic core loss is reduced; therefore, there can beobtained a function that improves rotating machine efficiency.

The foregoing and other object, features, aspects, and advantages of thepresent application will become more apparent from the followingdetailed description of the present application when taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a sectional view of an electric rotating machine according toEmbodiment 1;

FIG. 2 is an overview view of a rotor of the electric rotating machineaccording to Embodiment 1;

FIG. 3 is an overview view of a pole core body of the electric rotatingmachine according to Embodiment 1;

FIG. 4 is an overview view of a first pole of the electric rotatingmachine according to Embodiment 1;

FIG. 5 is a sectional view of the pole core body of the electricrotating machine according to Embodiment 1;

FIG. 6 is a front view of the pole core body of the electric rotatingmachine according to Embodiment 1;

FIG. 7 is a magnetic circuit diagram for explaining a magnetic flux pathof the electric rotating machine according to Embodiment 1;

FIG. 8 is a sectional view showing the magnetic flux path of theelectric rotating machine according to Embodiment 1;

FIG. 9 is a block diagram showing an electrical circuit of the electricrotating machine according to Embodiment 1;

FIG. 10 is a chart showing magnetomotive force of a preceding examplecontrasted with the electric rotating machine according to Embodiment 1;

FIG. 11 is a chart showing magnetomotive force of the electric rotatingmachine according to Embodiment 1;

FIG. 12 is a chart for explaining a harmonic component of magnetomotiveforce of the electric rotating machine according to Embodiment 1;

FIG. 13 is a core loss comparison chart for explaining core loss of theelectric rotating machine according to Embodiment 1;

FIG. 14 is a magnetic circuit diagram of the electric rotating machineaccording to Embodiment 1;

FIG. 15 is a sectional view showing a magnetic flux path of the electricrotating machine according to Embodiment 1;

FIG. 16 is a sectional view showing a magnetic flux path of the electricrotating machine according to Embodiment 1;

FIG. 17 is a sectional view of a pole core body of an electric rotatingmachine according to Embodiment 2;

FIG. 18 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 3;

FIG. 19 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 4;

FIG. 20 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 5;

FIG. 21 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 6;

FIG. 22 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 7;

FIG. 23 is a sectional view showing a magnetic flux path of an electricrotating machine according to Embodiment 8;

FIG. 24 is a typical view showing an example of the arrangement of amagnetic pole of a rotor and a permanent magnet of an electric rotatingmachine according to Embodiment 9; and

FIG. 25 is a typical view showing the arrangement of a magnetic pole anda permanent magnet of a rotor of an electric rotating machine accordingto Embodiment 10.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, embodiments of an electric rotating machine according tothe present application will be described on the basis of drawings. Therespective drawings show elements necessary for explaining theembodiments and actually all the elements are not necessarily shown. Inthe case of referring to directions such as top and bottom or left andright, the directions are based descriptions of the drawings. Thewording “fix” is optional if an object can be fixed and its fixingmethod does not matter. The wording “equal” means the same orsubstantially the same and, if different within a range of dimensionaltolerance, a belonging function is regarded as the same.

Embodiment 1

FIG. 1 is a sectional view exemplarily showing an electric rotatingmachine according to Embodiment 1; FIG. 2 is an overview view showing arotor of the electric rotating machine according to Embodiment 1; FIG. 3is a perspective view showing an overview of a pole core body applied tothe rotor of the electric rotating machine according to Embodiment 1;and FIG. 4 is a perspective view showing a first pole that constitutesthe overview of the pole core body. In FIG. 1 to FIG. 4 , an electricrotating machine 1 serving as a vehicular alternating current (AC)generator motor is divided into a rotating machine unit 2 and anelectrical device unit 3; and the electrical device unit 3 is configuredto supply power to a rotor winding 18 via a brush 8 and a slip ring 9and is furnished with a power circuit section that supplies power to astator winding 12.

In the rotating machine unit 2, a shaft 6 is supported to substantiallybowl-shaped aluminum front and rear brackets 4 via bearings 7; and theshaft 6 is provided with a pulley 5 that is connected to an engine via abelt (not shown in the drawing). The front and rear brackets 4 includetherein: a rotor 13 which is integrally provided with the shaft 6 and isrotatably disposed; a fan 14 fixed to the axial both end surfaces of therotor 13; and a stator 10 which surrounds the outer circumference of therotor 13 with a certain gap with respect to the rotor 13 and is fixed tothe front and rear brackets 4.

The stator 10 includes: a cylindrical shaped stator core 11; and thestator winding 12 which is wound around the stator core 11 and receivesmagnetic flux from the rotor winding 18 (to be described later)according to the rotation of the rotor 13. The rotor 13 includes: therotor winding 18 which generates the magnetic flux by a current suppliedfrom the electrical device unit 3 via the brush 8 and the slip ring 9;and a pole core body 15 which is provided so as to cover the rotorwinding 18 and in which a magnetic pole is formed by the magnetic flux.The pole core body 15 is constitutionally divided into a first pole 16and a second pole 17, each made of low-carbon steel such as S10C by acold forging manufacturing method or the like.

The first pole 16 has: a boss portion 16 c which is made into acylindrical body whose end surface is a regular circle and in which ashaft pass-through hole 19 is formed passing through a shaft centerposition; a thick ring shaped yoke portion 16 b extendedly provided fromone end edge portion of the boss portion 16 c to the radial outside; anda first claw-shaped magnetic pole portion 16 a extendedly provided froman outer circumferential portion of the yoke portion 16 b to the axiallyother end side. As for the first claw-shaped magnetic pole portion 16 a,its outermost diameter surface shape is a substantially trapezoidalshape, its circumferential width becomes gradually narrower toward thetop end side, and its radial thickness is formed into a tapered shapebecoming gradually thinner toward the top end side. Then, for example,eight first claw-shaped magnetic pole portions 16 a are arranged at acircumferentially equal pitch in the outer circumferential portion ofthe yoke portion 16 b.

The second pole 17 has: a boss portion which is made into a cylindricalbody whose end surface is a regular circle and in which a shaftpass-through hole is formed passing through the shaft center positionlike the first pole 16; a thick ring shaped yoke portion 17 b extendedlyprovided from one end edge portion of the boss portion to the radialoutside; and a second claw-shaped magnetic pole portion 17 a extendedlyprovided from an outer circumferential portion of the yoke portion 17 bto the axially other end side. As for the second claw-shaped magneticpole portion 17 a, its outermost diameter surface shape is asubstantially trapezoidal shape, its circumferential width becomesgradually narrower toward the top end side, and its radial thickness isformed into a tapered shape becoming gradually thinner toward the topend side. Then, for example, eight second claw-shaped magnetic poleportions 17 a are arranged at a circumferentially equal pitch in theouter circumferential portion of the yoke portion 17 b.

FIG. 5 and FIG. 6 are a sectional view and a front view, respectively,each of which shows the first pole 16 and the second pole 17 accordingto Embodiment 1. FIG. 5 and FIG. 6 show focusing on one eighth portionin the rotation direction (circumferential direction). Since the firstclaw-shaped magnetic pole portion 16 a and the second claw-shapedmagnetic pole portion 17 a are arranged in rotational symmetry, oneeighth portion is shown. FIG. 5 is the axial sectional view of FIG. 6 .Incidentally, in FIG. 5 , a direction perpendicular to the page space isthe axial direction of the first pole 16 and the second pole 17; and theupper direction of the page space is the radial direction of the firstpole 16 and the second pole 17. The same is also true on the otherdrawings similar to FIG. 5 . Furthermore, in FIG. 6 , the rightdirection of the page space is the rotation direction of the first pole16 and the second pole 17; and the upper direction of the page space isthe axial direction of the first pole 16 and the second pole 17. Apermanent magnet 23 is furnished in some of inter-magnetic pole portions22, the inter-magnetic pole portion 22 being formed between the firstclaw-shaped magnetic pole portion 16 a and the second claw-shapedmagnetic pole portion 17 a; the first pole 16 and the second pole 17 arecombined so that the first claw-shaped magnetic pole portion 16 a andthe second claw-shaped magnetic pole portion 17 a are alternatelyengaged; first magnetic flux adjusting portions 24 a, 24 b (projectionportions), which reduce the distance between the first claw-shapedmagnetic pole portion 16 a and the second claw-shaped magnetic poleportion 17 a, are provided on both side surfaces in the rotationdirection of the first claw-shaped magnetic pole portion 16 a; andsecond magnetic flux adjusting portions 25 a, 25 b (projectionportions), which reduce the distance between the first claw-shapedmagnetic pole portion 16 a and the second claw-shaped magnetic poleportion 17 a, are provided on both side surfaces in the rotationdirection of the second claw-shaped magnetic pole portion 17 a.Furthermore, a pair of first chamfered portions 26 a, 26 b provided onboth end sides in the rotation direction are formed on the stator sidesurface of the first claw-shaped magnetic pole portion 16 a; and a pairof second chamfered portions 27 a, 27 b provided on both end sides inthe rotation direction are formed on the stator side surface of thesecond claw-shaped magnetic pole portion 17 a. The shapes of the firstchamfered portion 26 a and the second chamfered portion 27 a, which areprovided adjacent to an inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted, differ from those of the firstchamfered portion 26 b and the second chamfered portion 27 b, which areprovided adjacent to an inter-magnetic pole portion 22 b where thepermanent magnet is not inserted. For example, in FIG. 5 and FIG. 6 ,hatching portions in FIG. 6 denote the first chamfered portions 26 a, 26b and the second chamfered portions 27 a, 27 b.

The operation of the electric rotating machine 1 serving as thevehicular AC generator motor will be described using FIG. 7 to FIG. 9 .As shown in FIG. 9 , power is supplied to the rotor winding 18 from abattery 20 of a battery section 105 and current is energized via thebrush 8 and the slip ring 9. In this regard, however, in FIG. 9 , acircuit that supplies power (switching element etc.) to the rotorwinding 18 is not shown. By the current energized to the rotor winding18, rotor magnetic flux and magnet magnetic flux are supplied from therotor 13 to the stator winding 12 by a magnetic circuit like FIG. 7 .Furthermore, as shown in a magnetic flux path view shown in FIG. 8 ,magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough the second magnetic flux adjusting portion 25 a via the firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia the stator 10.

The operation of a power circuit section 103 differs between in powerrunning and in regeneration. In the power running, power is supplied tothe power circuit section 103 from the battery 20 via a power supplyterminal; a control circuit section 104 performs ON/OFF control ofrespective switching elements 21 of the power circuit section 103, anddirect current (DC) and/or AC power is supplied to the stator winding 12of a stator winding section 101. The leakage magnetic flux 28 and theoutput magnetic flux 29 formed by the rotor winding 18 and the permanentmagnet 23 interlink with the DC current and/or the AC current whichflows through the stator winding 12 and thus driving torque isgenerated. The rotor 13 is rotated and driven by the driving torque. Inthe regeneration, the output magnetic flux formed by the rotor winding18 of the rotor winding section 102 and the permanent magnet 23interlinks with the stator 10, induced voltage is generated in the rotorwinding 18, ON/OFF control of the respective switching elements of thepower circuit section 103 is performed by the control circuit section104, and power is supplied to the battery 20.

FIG. 10 is a chart showing rotor magnetomotive force of a precedingexample to be contrasted with the electric rotating machine according toEmbodiment 1; and FIG. 11 is a chart showing rotor magnetomotive forceof the electric rotating machine according to Embodiment 1. FIG. 12 andFIG. 13 are a frequency analysis chart and a core loss reduction chartof the rotor magnetomotive force, respectively, each showing an effectof the embodiment. Incidentally, in FIG. 10 and FIG. 11 , rotormagnetomotive force made in the inter-magnetic pole portion where thepermanent magnet is inserted is represented by MFa; and rotormagnetomotive force made in the inter-magnetic pole portion where thepermanent magnet is not inserted is represented by MFb.

In the preceding example shown in FIG. 10 , since the shapes of thefirst chamfered portion 26 a and the second chamfered portion 27 a,which are adjacent to the inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted, are the same as those of the firstchamfered portion 26 b and the second chamfered portion 27 b, which areadjacent to the inter-magnetic pole portion 22 b where the permanentmagnet is not inserted, a mechanism that adjusts the strength of therotor magnetomotive force is not provided and the fluctuation width ofthe magnetomotive force in the inter-magnetic pole portion 22 a wherethe permanent magnet 23 is inserted is larger than that in theinter-magnetic pole portion 22 b where the permanent magnet is notinserted; and accordingly, the rotor magnetomotive force waveform is anasymmetric waveform.

On the other hand, in the present embodiment, for example, as shown inFIG. 6 , since the rotation direction widths WMa of the first chamferedportion 26 a and the second chamfered portion 27 a, which are adjacentto the inter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, are made larger than the rotation direction widths WMb of thefirst chamfered portion 26 b and the second chamfered portion 27 b,which are adjacent to the inter-magnetic pole portion 22 b where thepermanent magnet is not inserted, decreasing adjustment of the rotormagnetomotive force MFa, which is made in the inter-magnetic poleportion 22 a where the permanent magnet 23 is inserted, is performed andincreasing adjustment of the rotor magnetomotive force MFb, which ismade in the inter-magnetic pole portion 22 b where the permanent magnet23 is not inserted, can be performed; therefore, the rotor magnetomotiveforce waveform can be made a symmetric waveform as shown in FIG. 11 . Asa result, a harmonic component of the rotor magnetomotive force waveformmade by the present embodiment like FIG. 12 can be made smaller thanthat of the preceding example and therefore motor core loss can bereduced like FIG. 13 . Incidentally, in FIG. 12 and FIG. 13 ,characteristics in the preceding example are represented by a bar chartA (dot display); and characteristics in the present embodiment arerepresented by a bar chart B (hatching display).

Incidentally, in the present embodiment, output magnetic flux paths inwhich the magnetic flux made by the rotor winding and the magnetic fluxmade by the permanent magnet 23 interlink with the stator 10 are thesame (magnetic flux paths in which both output magnetic fluxes shown inFIG. 7 and FIG. 8 are strengthened each other); therefore, in the caseof the rotor magnetomotive force made in the inter-magnetic pole portion22 a where the permanent magnet 23 is inserted, magnet magnetomotiveforce is added to the magnetic flux made by the rotor winding 18.Consequently, the rotation direction widths WMa of the first chamferedportion 26 a and the second chamfered portion 27 a, which are adjacentto the inter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, are made larger than the rotation direction widths WMb of thefirst chamfered portion 26 b and the second chamfered portion 27 b,which are adjacent to the inter-magnetic pole portion 22 b where thepermanent magnet 23 is not inserted, whereby the surfaces of the firstand the second claw-shaped magnetic pole portions, each surface facingthe stator, are adjusted and the rotor magnetomotive force waveforms ismade symmetric. In FIG. 6 , the rotation direction widths WMa of thefirst chamfered portion 26 a and the second chamfered portion 27 a,which are adjacent to the inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted, are set to 3 mm; and the rotationdirection widths WMb of the first chamfered portion 26 b and the secondchamfered portion 27 b, which are adjacent to the inter-magnetic poleportion 22 b where the permanent magnet 23 is not inserted, are set to1.6 mm.

As a modified example, even when the direction of the output magneticflux path made by the rotor winding magnetomotive force is differentfrom that made by the magnet magnetomotive force (magnetic flux paths inwhich both output magnetic fluxes shown in FIG. 14 and FIG. 15 areweakened each other), the reduction effect of core loss according to thepresent embodiment can be obtained. In that case, the magnetmagnetomotive force is subtracted from the rotor winding magnetomotiveforce made in the inter-magnetic pole portion 22 a where the permanentmagnet is inserted and thus the fluctuation width of the rotormagnetomotive force made in the inter-magnetic pole portion 22 b wherethe permanent magnet 23 is not inserted becomes larger. Consequently, ifthe rotation direction widths WMa of the first chamfered portion 26 aand the second chamfered portion 27 a, which are adjacent to theinter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, are made smaller than the rotation direction widths WMb of thefirst chamfered portion 26 b and the second chamfered portion 27 b,which are adjacent to the inter-magnetic pole portion 22 b where thepermanent magnet 23 is not inserted, a function intended for the rotormagnetomotive force waveform can be obtained.

Furthermore, in the present embodiment, in order to adjust themagnetomotive force made by the permanent magnet, the configuration ismade such that the rotation direction widths of the first chamferedportions 26 a, 26 b and those of the second chamfered portions 27 a, 27b are different between the inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted and the inter-magnetic pole portion 22 bwhere the permanent magnet 23 is not inserted; however, as anothermodified example, the reduction effect of the core loss can also beobtained by adjusting the magnetomotive force made by the rotor winding18. In that case, as shown in FIG. 16 , since magnetic flux made by therotor winding is divided into: output magnetic flux 29 shown by a solidline, which interlinks with the stator; and leakage magnetic flux 28shown by a dashed line, which passes through the first magnetic fluxadjusting portions 24 a, 24 b and the second magnetic flux adjustingportions 25 a, 25 b and closes in the rotor, the shapes of the firstmagnetic flux adjusting portion 24 a and the second magnetic fluxadjusting portion 25 a, which are adjacent to the inter-magnetic poleportion 22 a where the permanent magnet 23 is inserted, may differ fromthose of the first magnetic flux adjusting portion 24 a and the secondmagnetic flux adjusting portion 25 b, which are adjacent to theinter-magnetic pole portion 22 b where the permanent magnet 23 is notinserted. Specifically, if the rotor magnetomotive force, which is madein the inter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, is made small by increasing the rotation direction widths WFaof the first magnetic flux adjusting portion 24 a and the secondmagnetic flux adjusting portion 25 a, which are adjacent to theinter-magnetic pole portion 22 a where the permanent magnet 23 isinserted; and if the rotor magnetomotive force made in theinter-magnetic pole portion 22 b where the permanent magnet 23 is notinserted is made large by reducing the rotation direction widths WFb ofthe first magnetic flux adjusting portion 24 b and the second magneticflux adjusting portion 25 b, which are adjacent to the inter-magneticpole portion 22 b where the permanent magnet 23 is not inserted, therotor magnetomotive force waveform can be made a symmetric waveform.That is, the rotation direction widths WFa of the first magnetic fluxadjusting portion 24 a and the second magnetic flux adjusting portion 25a are made larger than the rotation direction widths WFb of the firstmagnetic flux adjusting portion 24 b and the second magnetic fluxadjusting portion 25 b. In FIG. 16 , the rotation direction widths WFaof the first magnetic flux adjusting portion 24 a and the secondmagnetic flux adjusting portion 25 a, which are adjacent to theinter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, are set to 2.5 mm; and the rotation direction widths WFb ofthe first magnetic flux adjusting portion 24 b and the second magneticflux adjusting portion 25 b, which are adjacent to the inter-magneticpole portion 22 b where the permanent magnet 23 is not inserted, are setto 1.1 mm.

Embodiment 2

FIG. 17 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 2. The rotation direction widthsWMa of a first chamfered portion 26 a and a second chamfered portion 27a, which are adjacent to an inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted, is wider than the rotation directionwidths WMb of a first chamfered portion 26 b and a second chamferedportion 27 b, which are adjacent to an inter-magnetic pole portion 22 bwhere the permanent magnet 23 is not inserted.

According to Embodiment 2, the rotation direction widths of the firstchamfered portion 26 a and the second chamfered portion 27 a, which areadjacent to the inter-magnetic pole portion 22 a where the permanentmagnet 23 is inserted, are configured to be wider than those of thefirst chamfered portion 26 b and the second chamfered portion 27 b,which are adjacent to the inter-magnetic pole portion 22 b where thepermanent magnet is not inserted; thus, a reduction function of motorcore loss can be obtained by magnetic flux paths in which outputmagnetic fluxes of magnet magnetomotive force and rotor windingmagnetomotive force in FIG. 7 and FIG. 8 are strengthened each otherlike Embodiment 1. Consequently, both an improvement effect of rotormagnetomotive force and a reduction effect of motor core loss can becompatible by inserting the permanent magnet in addition to a rotorwinding.

Embodiment 3

FIG. 18 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 3. The rotation direction widthsWMa of a first chamfered portion 26 a and a second chamfered portion 27a, which are adjacent to an inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted, are wider than half the radial widthWrh of the magnetic flux output surface of the permanent magnet 23.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough a second magnetic flux adjusting portion 25 a via a firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , decreasingadjustment of magnet magnetic flux made in the inter-magnetic poleportion is performed by widening the rotation direction widths of thefirst chamfered portion 26 a and the second chamfered portion 27 a,which are adjacent to the inter-magnetic pole portion, in theinter-magnetic pole portion 22 a where the permanent magnet 23 isinserted. In this case, since magnetomotive force equivalent to half themagnet magnetomotive force having two magnetic circuits becomes outputmagnetic flux, a configuration effective for actualizing the decreasingadjustment of the magnetic flux is made such that there may be selectedthe rotation direction widths of the first chamfered portion 26 a andthe second chamfered portion 27 a on the basis of the size of half theradial width Wrh of the magnet, which corresponds to the output surfaceof the magnet magnetomotive force that contributes to the outputmagnetic flux. Consequently, by the configuration of Embodiment 3, therotor magnetomotive force waveform is made a symmetric waveform and areduction function of motor core loss can be effectively obtained.

Embodiment 4

FIG. 19 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 4. The rotation direction widthsWMb of the first chamfered portion 26 b and the second chamfered portion27 b, which are adjacent to an inter-magnetic pole portion 22 b wherethe permanent magnet 23 is not inserted, are narrower than half theradial width Wrh of the magnetic flux output surface of the permanentmagnet 23.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough a second magnetic flux adjusting portion 25 a via a firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , decreasingadjustment of rotor winding magnetic flux is performed by the rotationdirection widths WMa of a first chamfered portion 26 a and a secondchamfered portion 27 a, which are adjacent to an inter-magnetic poleportion 22 a where the permanent magnet 23 is inserted; and increasingadjustment of the rotor winding magnetic flux is performed by therotation direction widths WMb of the first chamfered portion 26 b andthe second chamfered portion 27 b, which are adjacent to theinter-magnetic pole portion 22 b where the permanent magnet is notinserted. In this case, it is effective to achieve a configuration thatadjusts output magnetic flux equivalent to half the magnet magnetomotiveforce by the rotation direction widths of the first chamfered portion 26a and the second chamfered portion 27 a, which are adjacent to theinter-magnetic pole portion 22 a where the permanent magnet is inserted;thus, a function in which a rotor magnetomotive force waveform is madesymmetric can be effectively obtained by the configuration of Embodiment4.

Embodiment 5

FIG. 20 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 5. The rotation direction widthsWHa of a first magnetic flux adjusting portion 24 a and a secondmagnetic flux adjusting portion 25 a, which are adjacent to aninter-magnetic pole portion 22 a where the permanent magnet 23 isinserted, are wider than the rotation direction widths WHb of a firstmagnetic flux adjusting portion 24 b and a second magnetic fluxadjusting portion 25 b, which are adjacent to an inter-magnetic poleportion 22 b where the permanent magnet is not inserted.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms the leakage magnetic flux 28 which passesthrough the second magnetic flux adjusting portion 25 a via the firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , the rotationdirection widths of the first magnetic flux adjusting portion 24 a andthe second magnetic flux adjusting portion 25 a, which are adjacent tothe inter-magnetic pole portion 22 a where the permanent magnet isinserted, are widened to increase the magnet leakage magnetic flux;thus, decreasing adjustment of the output magnetic flux can be performedand therefore a reduction effect of core loss can be effectivelyobtained by the configuration of Embodiment 5.

Embodiment 6

FIG. 21 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 6. The radial width WK of a firstmagnetic flux adjusting portion 24 a and a second magnetic fluxadjusting portion 25 a, which are adjacent to an inter-magnetic poleportion 22 a where the permanent magnet 23 is inserted, is wider thanhalf the radial width Wrh of the magnetic flux output surface of thepermanent magnet.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough the second magnetic flux adjusting portion 25 a via the firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , the radialdirection widths of the first magnetic flux adjusting portion 24 a andthe second magnetic flux adjusting portion 25 a, which are adjacent tothe inter-magnetic pole portion 22 a where the permanent magnet isinserted, are widened to increase the magnet leakage magnetic flux;thus, decreasing adjustment of the output magnetic flux can beperformed. In this case, a reduction effect of core loss can beeffectively obtained by the configuration of the present embodiment inwhich the radial widths WK of the first magnetic flux adjusting portion24 a and the second magnetic flux adjusting portion 25 a are made widerthan half the radial width Wrh that is the output surface of the magnetmagnetic flux to reduce the leakage magnetic flux equivalent to half themagnet magnetomotive force.

Embodiment 7

FIG. 22 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 7. A first magnetic flux adjustingportion 24 b and a second magnetic flux adjusting portion 25 b are notprovided in an inter-magnetic pole portion 22 b where the permanentmagnet 23 is not inserted and the first magnetic flux adjusting portion24 b is not adjacent to the second magnetic flux adjusting portion 25 b.That is, the first magnetic flux adjusting portion 24 a and the secondmagnetic flux adjusting portion 25 a are provided only in aninter-magnetic pole portion 22 a where the permanent magnet 23 isinserted.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough the second magnetic flux adjusting portion 25 a via the firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , decreasingadjustment of the output magnetic flux is performed by the firstmagnetic flux adjusting portion 24 a and the second magnetic fluxadjusting portion 25 a, which are adjacent to the inter-magnetic poleportion 22 a where the permanent magnet 23 is inserted; and increasingadjustment of the output magnetic flux is performed by the firstmagnetic flux adjusting portion 24 b and the second magnetic fluxadjusting portion 25 b, which are adjacent to the inter-magnetic poleportion 22 b where the permanent magnet is not inserted. In this case, aconfiguration is made such that the second magnetic flux adjustingportion 25 b and the first magnetic flux adjusting portion 24 b are notadjacent to the inter-magnetic pole portion 22 b where the permanentmagnet is not inserted; thus, increasing adjustment of theinter-magnetic pole portion 22 b where the permanent magnet is notinserted produces the maximum output magnetic flux and therefore rotormagnetomotive force can be utilized as the maximum output magnetic fluxwhile obtaining a reduction function of motor core loss.

Embodiment 8

FIG. 23 is a sectional view showing the vicinity of a first claw-shapedmagnetic pole portion 16 a of a first pole 16, a second claw-shapedmagnetic pole portion 17 a of a second pole 17, and a permanent magnet23 of a rotor according to Embodiment 8. A first chamfered portion 26 band a second chamfered portion 27 b are not provided in aninter-magnetic pole portion 22 b where the permanent magnet is notinserted; and the first chamfered portion 26 b and the second chamferedportion 27 b are not adjacent to the inter-magnetic pole portion 22 b.That is, the first chamfered portion 26 a and the second chamferedportion 27 b are provided only in an inter-magnetic pole portion 22 awhere the permanent magnet 23 is inserted.

Magnetic flux made by the permanent magnet 23 is divided into: amagnetic circuit that forms leakage magnetic flux 28 which passesthrough the second magnetic flux adjusting portion 25 a via the firstmagnetic flux adjusting portion 24 a and closes in the rotor; and outputmagnetic flux 29 which passes through the second claw-shaped magneticpole portion 17 a from the first claw-shaped magnetic pole portion 16 avia a stator 10. In the case of a relationship where magnetmagnetomotive force and rotor winding magnetomotive force arestrengthened each other as shown in FIG. 7 and FIG. 8 , decreasingadjustment of the output magnetic flux is performed by the firstchamfered portion 26 a and the second chamfered portion 27 a, which areadjacent to the inter-magnetic pole portion 22 a where the permanentmagnet is inserted; and increasing adjustment of the output magneticflux is performed by the first chamfered portion 26 b and the secondchamfered portion 27 b, which are adjacent to the inter-magnetic poleportion 22 b where the permanent magnet is not inserted. In this case, aconfiguration is made such that the first chamfered portion 26 b and thesecond chamfered portion 27 b are not adjacent to the inter-magneticpole portion 22 b where the permanent magnet is not inserted; thus,increasing adjustment of the inter-magnetic pole portion 22 b where thepermanent magnet is not inserted produces the maximum output magneticflux and therefore rotor magnetomotive force can be utilized as themaximum output magnetic flux while obtaining a reduction function ofmotor core loss.

Embodiment 9

FIG. 24 is a typical view showing the arrangement of a magnetic pole anda permanent magnet 23 of a rotor 13 of an electric rotating machineaccording to Embodiment 9. In the same drawing, a directionperpendicular to the page space is the axial direction of the rotor 13;the upper direction of the page space is the radial direction of therotor 13; and the left direction of the page space is the rotationdirection of the rotor 13. The number of inter-magnetic pole portions 22a where the permanent magnet 23 is inserted is the same as that ofinter-magnetic pole portions 22 b where the permanent magnet 23 is notinserted. The rotation direction is taken as a linear direction by beingsimplified in FIG. 24 ; and a first claw-shaped magnetic pole portion 16a and a second claw-shaped magnetic pole portion 17 a, which constitutethe magnetic pole, and the permanent magnet 23 are linearly shown.

The number of the inter-magnetic pole portions 22 a where the permanentmagnet 23 is inserted is the same as that of the inter-magnetic poleportions 22 b where the permanent magnet 23 is not inserted; thus, thenumber of the inter-magnetic pole portions where magnet magnetomotiveforce is added to rotor winding magnetomotive force by inserting thepermanent magnet 23 can be the same as that of the inter-magnetic poleportions where the rotor winding magnetomotive force is maintained bynot inserting the permanent magnet 23 and therefore a function in whicha rotor magnetomotive force waveform is made a symmetric shape can beeffectively obtained.

Embodiment 10

FIG. 25 is a typical view showing the arrangement of a magnetic pole anda permanent magnet 23 of a rotor 13 of an electric rotating machineaccording to Embodiment 10. In the same drawing, a directionperpendicular to the page space is the axial direction of the rotor 13;the upper direction of the page space is the radial direction of therotor 13; and the left direction of the page space is the rotationdirection of the rotor 13. An inter-magnetic pole portion 22 a where thepermanent magnet 23 is inserted and an inter-magnetic pole portion 22 bwhere the permanent magnet 23 is not inserted, are alternately arrangedin the rotation direction. The rotation direction is taken as a lineardirection by being simplified in FIG. 25 ; and a first claw-shapedmagnetic pole portion 16 a and a second claw-shaped magnetic poleportion 17 a, which constitute the magnetic pole, and the permanentmagnet 23 are linearly shown.

The inter-magnetic pole portion 22 a where the permanent magnet 23 isinserted and the inter-magnetic pole portion 22 b where the permanentmagnet is not inserted, are alternately arranged in the rotationdirection; thus, periodicity of the magnitude of a rotor magnetomotiveforce waveform can be regarded as one period in the two inter-magneticpole portions and asymmetry property becomes a minimum unit.Consequently, a change in the structure of a chamfered portion or amagnetic flux adjusting portion, which is for obtaining a reductioneffect of motor core loss can be performed in the period of the minimumunit. If the period of the structure change can be reduced, when metalmold processing is applied for each period, the structure of metal moldcan take a simpler form; thus, production facilities for obtaining thereduction effect of motor core loss can be simplified.

On the basis of the foregoing respective embodiments, the embodiments ofthe electric rotating machine according to the present application havethe configuration in which the shapes of the first chamfered portion andthe second chamfered portion, which are adjacent to the inter-magneticpole portion where the permanent magnet is inserted, differ from thoseof the first chamfered portion and the second chamfered portion, whichare adjacent to the inter-magnetic pole portion where the permanentmagnet is not inserted, and/or the configuration in which the shapes ofthe first magnetic flux adjusting portion and the second magnetic fluxadjusting portion, which are adjacent to the inter-magnetic pole portionwhere the permanent magnet is inserted, differ from those of the firstmagnetic flux adjusting portion and the second magnetic flux adjustingportion, which are adjacent to the inter-magnetic pole portion where thepermanent magnet is not inserted; and both configurations influence onthe rotor magnetomotive force waveform.

The present application describes various exemplified embodiments andexamples; however, various features, aspects, and functions described inone or a plurality of embodiments are not limited to specificembodiments, but are applicable to embodiments individually or invarious combinations thereof. Therefore, countless modified examples notexemplified are assumed in technical ranges disclosed in thespecification of the present application. For example, there include: acase in which at least one constituent element is modified; a case,added; or a case, deleted; and a case in which at least one constituentelement is extracted to combine with constituent elements of otherembodiments.

What is claimed is:
 1. An electric rotating machine comprising: a rotor;and a stator configured to be arranged via an air gap with respect tothe outer circumference of the rotor; the rotor being configured to havea rotor winding, and a pole core body which is constituted by combininga first pole with a second pole and wherein the rotor winding isarranged in an internal space formed by the first pole and the secondpole; the first pole being configured to have a plurality of firstclaw-shaped magnetic pole pieces arranged with a space in the a rotationdirection of the rotor; the second pole being configured to have aplurality of second claw-shaped magnetic pole pieces arranged with aspace in the rotation direction of the rotor; the first claw-shapedmagnetic pole pieces and the second claw-shaped magnetic pole piecesbeing configured to be furnished with a permanent magnet in some ofinter-magnetic poles, the inter-magnetic poles being formed between thefirst and second claw-shaped magnetic pole pieces; and the first poleand the second pole being configured to be combined so that the firstclaw-shaped magnetic pole pieces and the second claw-shaped magneticpole pieces respectively are alternately engaged; the electric rotatingmachine including: first magnetic flux adjusters configured to beprovided on at least one side surface in the rotation direction of thefirst claw-shaped magnetic pole pieces to reduce the distance betweenthe first claw-shaped magnetic pole pieces and the second claw-shapedmagnetic pole piece pieces; second magnetic flux adjusters configured tobe provided on at least one side surface in the rotation direction ofthe second claw-shaped magnetic pole pieces to reduce the distancebetween the first claw-shaped magnetic pole pieces and the secondclaw-shaped magnetic pole pieces; a pair of first chamfers configured tobe provided on at least one end side in the rotation direction on thestator side surface of the first claw-shaped magnetic pole pieces; and apair of second chamfers configured to be provided on at least one endside in the rotation direction on the stator side surface of the secondclaw-shaped magnetic pole pieces; wherein the shapes of the firstchamfer and the second chamfer, which are adjacent to the inter-magneticpole where the permanent magnet is inserted, are configured to be of asame shape; and wherein the shapes of the first magnetic flux adjusterand the second magnetic flux adjuster, which are adjacent to theinter-magnetic pole where the permanent magnet is inserted, areconfigured to be of a same shape.
 2. The electric rotating machineaccording to claim 1, wherein the first magnetic flux adjuster and thesecond magnetic flux adjuster are configured not to be adjacent to theinter-magnetic pole where the permanent magnet is not inserted.
 3. Theelectric rotating machine according to claim 1, wherein the firstchamfer and the second chamfer are configured not to be adjacent to theinter-magnetic pole where the permanent magnet is not inserted.
 4. Anelectric rotating machine comprising: a rotor; and a stator configuredto be arranged via an air gap with respect to the outer circumference ofthe rotor; the rotor being configured to have a rotor winding, and apole core body which is constituted by combining a first pole with asecond pole and wherein the rotor winding is arranged in an internalspace formed by the first pole and the second pole; the first pole beingconfigured to have a plurality of first claw-shaped magnetic pole piecesarranged with a space in the a rotation direction of the rotor; thesecond pole being configured to have a plurality of second claw-shapedmagnetic pole pieces arranged with a space in the rotation direction ofthe rotor; the first claw-shaped magnetic pole pieces and the secondclaw-shaped magnetic pole pieces being configured to be furnished with apermanent magnet in some of inter-magnetic poles, the inter-magneticpoles being formed between the first and second claw-shaped magneticpole pieces; and the first pole and the second pole being configured tobe combined so that the first claw-shaped magnetic pole pieces and thesecond claw-shaped magnetic pole pieces respectively are alternatelyengaged; the electric rotating machine including: first magnetic fluxadjusters configured to be provided on both side surfaces in therotation direction of the first claw-shaped magnetic pole pieces toreduce the distance between the first claw-shaped magnetic pole piecesand the second claw-shaped magnetic pole piece pieces; second magneticflux adjusters configured to be provided on both side surfaces in therotation direction of the second claw-shaped magnetic pole pieces toreduce the distance between the first claw-shaped magnetic pole piecesand the second claw-shaped magnetic pole pieces; a pair of firstchamfers configured to be provided on both end sides in the rotationdirection on the stator side surface of the first claw-shaped magneticpole pieces; and a pair of second chamfers configured to be provided onboth end sides in the rotation direction on the stator side surface ofthe second claw-shaped magnetic pole pieces; wherein the shapes of thefirst chamfer and the second chamfer, which are adjacent to theinter-magnetic pole where the permanent magnet is inserted, areconfigured to be different from shapes of the first chamfer and thesecond chamfer, which are adjacent to an inter-magnetic pole where thepermanent magnet is not inserted.
 5. An electric rotating machinecomprising: a rotor; and a stator configured to be arranged via an airgap with respect to the outer circumference of the rotor; the rotorbeing configured to have a rotor winding, and a pole core body which isconstituted by combining a first pole with a second pole and wherein therotor winding is arranged in an internal space formed by the first poleand the second pole; the first pole being configured to have a pluralityof first claw-shaped magnetic pole pieces arranged with a space in the arotation direction of the rotor; the second pole being configured tohave a plurality of second claw-shaped magnetic pole pieces arrangedwith a space in the rotation direction of the rotor; the firstclaw-shaped magnetic pole pieces and the second claw-shaped magneticpole pieces being configured to be furnished with a permanent magnet insome of inter-magnetic poles, the inter-magnetic poles being formedbetween the first and second claw-shaped magnetic pole pieces; and thefirst pole and the second pole being configured to be combined so thatthe first claw-shaped magnetic pole pieces and the second claw-shapedmagnetic pole pieces respectively are alternately engaged; the electricrotating machine including: first magnetic flux adjusters configured tobe provided on both side surfaces in the rotation direction of the firstclaw-shaped magnetic pole pieces to reduce the distance between thefirst claw-shaped magnetic pole pieces and the second claw-shapedmagnetic pole piece pieces; second magnetic flux adjusters configured tobe provided on both side surfaces in the rotation direction of thesecond claw-shaped magnetic pole pieces to reduce the distance betweenthe first claw-shaped magnetic pole pieces and the second claw-shapedmagnetic pole pieces; a pair of first chamfers configured to be providedon both end sides in the rotation direction on the stator side surfaceof the first claw-shaped magnetic pole pieces; and a pair of secondchamfers configured to be provided on both end sides in the rotationdirection on the stator side surface of the second claw-shaped magneticpole pieces; wherein the shapes of the first magnetic flux adjuster andthe second magnetic flux adjuster, which are adjacent to theinter-magnetic pole where the permanent magnet is inserted, areconfigured to be different from shapes of the first magnetic fluxadjuster and the second magnetic flux adjuster, which are adjacent tothe inter-magnetic pole where the permanent magnet is not inserted.